IEEE P802.11
Wireless LANs
CID 9153, 8810, 98811, 9495 (HE STA)
Date: 2018-12-25
Author(s):
Name / Affiliation / Address / Phone / email
Guoqing Li / Apple Inc. / 1 Infinity Loop, Cupertino, CA 95014 /
Yunbo Li / Huawei
Tomoko Adachi / Toshiba
Jarkko Knect / Apple
Chris Hartman / Apple
Abstract
This submission proposes resolutions for CID 9153, 8810 8811[MOU1], 9495
Interpretation of a Motion to Adopt
A motion to approve this submission means that the editing instructions and any changed or added material are actioned in the TGax Draft. This introduction is not part of the adopted material.
Editing instructions formatted like this are intended to be copied into the TGax Draft (i.e. they are instructions to the 802.11 editor on how to merge the text with the baseline documents).
TGax Editor: Editing instructions preceded by “TGax Editor” are instructions to the TGax editor to modify existing material in the TGax draft. As a result of adopting the changes, the TGax editor will execute the instructions rather than copy them to the TGax Draft.
CID / Line / Comment / Proposed Change / Resolution9153 / 28.3.3.6 / It is not clear on the possibility of the operation in secondary channels from 'primary 20 MHz channel as a mandatory mode' description. / Clarify the operation capability on secondary 20 MHz channels of 20 MHz-only STA, e.g., only primary 20 MHz support or else, and if it is required to operate, define the procedure and signaling. / Revised.
Propose to allow 20 MHz-operating STA to operate on any 20 MHz. Please see the text for details.
8810 / 28.3.3.6 / "A 20 MHz only HE STA operates in the primary 20 MHz channel as a mandatory mode." is not correct language for a standard. / Change to "A 20 MHz only HE STA shall only operate in the primary 20 MHz channel." / Revised.
Propose that 20MHz only STA shall support operating on primary channel and may optionally operate on non-primary channels. Please see the proposed text for details
8811 / 28.3.3.6 / "A 20 MHz only HE STA operates in the primary 20 MHz channel as a mandatory mode."
Having 20 MHz-only systems operate in only the primary channel is suboptimal. There should be an option for 20-MHz only devices to operate in any 20 MHz channels. / See comment / Agreed in principle.
Propose to allow 20 MHz-operating STA to operate on any 20 MHz. Please see the text for details.
94955 / 9.2.4.6.4.3 / Current ROM shall be improved to settle the case with large number of STA in narrow band ROM mode. Current ROM requires all STAs to occupy primary 20 MHz and causes low channel utility. Need to allocate some narrow band ROM STA to RU in non-primary portion. / The Channel Width field shall support indication of specific 20 MHz channel which STA prefers in this ROM mode. / Revised.
Propose to allow 20 MHz-operating STA to operate on any 20 MHz channel. Please see the text for details.
TGax Editor: Please modify this section as follows:
TGax Editor: Please modify the following subsection after 9.4.2.225
9.4.2.218HE Capabilities element
9.4.2.218.1 General
An HE STA declares that it is an HE STA by transmitting the HE Capabilities element.
The HE Capabilities element contains a number of fields that are used to advertise the HE capabilities of an HE STA. The HE Capabilities element is defined in Figure9-589cj (HE Capabilities element format).
Element ID / Length / HE MAC Capabilities Information / HE PHY Capabilities Information / Tx Rx HE MCS NSS Support / PPE Thresholds (optional) / STA Channel Switch Outage Time (optional)Octets: / 1 / 1 / 5 / 9 / 2 or more / variable / 1
HE Capabilities element format
The Element ID and Length fields are defined in 9.4.2.1 (General).
The HE MAC Capabilities Information, HE PHY Capabilities Information, Tx Rx HE MCS NSS Support, andPPE Thresholds and STA Channel Switch Outage Time fields are defined in the subclauses below.
9.4.2.218.2 HE MAC Capabilities Information field
The format of the HE MAC Capabilities Information field is defined in Figure9-589ck (HE MAC Capabilities Information field format).
B33 / B34 / B35 / B36B35B39QTP Support / A-BQR Support / Non-Primary Channel Operation / Reserved
Bits: / 1 / 1 / 1 / 45
HE MAC Capabilities Information field format (B1-B32 are omitted here)
TGax Editor: Please insert a row below to Table9-262z (Subfields of the HE MAC Capabilities Information field).
Subfields of the HE MAC Capabilities Information fieldSubfield / Definition / Encoding
Non-Primary Channel Operation / Indicates support for non-AP STA’s operation on non-primary channels / Set to 1 if dot11NonPrimaryChannelOptionallyImplemented is set to true.
Set to 0 otherwise.
TGax Editor: Please insert the following subsection after 9.4.2.218.5
9.4.2.218.6 STA Channel Switch Outage Time
The STA Channel Switch Outage Time field is present if Non-Primary Channel Operation field is set to 1. STA Channel Switch Outage Time field defines the outage time when the STA switches operating channel, in unit of 50 µs. A value 255indicates that the channel switch outage time is unknown.
TGax Editor: Please modify the following subsection as follows.
9.4.2.219 HE Operation element
The operation of HE STAs in an HE BSS is controlled by the HT Operation element, the VHT Operation element and the HE Operation element. The format of the HE Operation element is defined in Figure9-589cq (HE Operation element format).
Element ID / Length / HE Operation Parameters / Basic HE MCS And NSS Set / VHT Operation Information / Non-Primary Channel Operation TimeoutOctets: / 1 / 1 / 4 / 3 / 0 or 3(#3035) / 1
HE Operation element format
The non-primary Channel Operation Timeout field indicates a timeout value in units of 8 TUs that is used for non-AP STAs operating on non-primary channelto switch to primary channel if it has not received a trigger within this time (see section 27.16).
TGax Editor: Please insert the following subsection after 9.4.2.225
9.4.2.226 STA Channel SwitchRequest Element
The STA Channel Switch Request element defines the request sent by an HE non-AP STA to an HE AP to switch its operating channel or sent by an AP STA to request a non-AP STA to switch its operating channel. The format of STA Channel Switch RequestRequest element is shown in Figurexx (STA Channel Switch Request Element).
Element ID / Length / Element ID Extension / Channel Index / Primary Channel Period / Non-Primary Channel Operation TimeoutOctets: / 1 / 1 / 1 / 1 / 1 / 1[MOU2]
STA Channel Switch Request element
The Element ID and Length fields are defined in 9.4.2.1 (General).
The Channel Index field is a bitmap field that is used to indicate the 20 MHz channels within the BSS operating bandwidth with least significant bit indicating the lowest 20 MHz of the BSS bandwidth and most significant bit indicating the highest 20 MHz channel in a 160/80+80 MHz BSS.
Notes: When transmitted by an HE AP, only one bit is allowed to be set to 1, i.e., the non-AP STA is allowed by the AP to switch to a single 20 MHz channel. When transmitted by an HE non-AP STA, one or more more one than one bit are allowed to be set to 1 to report the candidate 20 MHz channels that the non-AP STA is willing to operate on (27.7.16).
If sent by an HE AP, the Primary Channel Period indicates the period, in unit of 1TU, starting from each DTIM that the AP will not transmit any traffic to STAs operating on non-primary channels. If sent by non-AP STA, this field is reserved.
If sent by non-AP STA, Tthe non-primary Channel Operation Timeout field indicates a timeout value in units of 8 TUs that is used for non-AP STAs operating on non-primary channel to switch to primary channel if it has not received a trigger within this time (see section 27.16). If sent by an HE AP, this field is reserved.
9.4.2.227 STA Channel Switch Response Element
The HE STA Channel Switch Response element defines the response sent by an HE non-AP STAin response to a STA Channel Switch Request sent by an HE AP or sent by an HE AP STA in response to a STA Channel Switch Request sent by a non-AP STA. The format of STA Channel Switch Response Request element is shown in Figurexx (STA Channel Switch Response Element).
Element ID / Length / Element ID Extension / Channel Index / Primary Channel Period / Non-Primary Channel Operation TimeoutOctets: / 1 / 1 / 1 / 1 / 1 / 1
STA Channel Switch Response element
The Element ID and Length fields are defined in 9.4.2.1 (General).
If the Status Code in the frame that contains this STA Channel Switch Response element is SUCCESS and if the STA Channel Switch Response frame that contains this STA Channel Switch Response element is from an HE AP, then the Channel Index field is specified in 9.4.2.226. Otherwise, the Channel Index field is reserved.
Note: The non-primary channel that the non-AP STA will operate on is decided by the AP..[a3] The non-AP STA sending the STA Channel Switch Response does not include Channel Index since it is decided by the AP.
The Primary Channel Period subfield is specified in 9.4.2.226.
The Non-Primary Channel Operation Timeout subfield is specified in 9.4.2.226.
9.3.3.5 Association Request frame format[a4]
Order: 11ai adds 24-28, 11ah adds 29-38, 11ak adds 24 (appears to be out of date), 11aj adds two (numbers unassigned)
Insert the following new row (header row shown for convenience) into Table9-29 (Association Request frame body):
Association Request frame bodyOrder / Information / Notes
43 / HE Capabilities / The HE Capabilities element is present when dot11HEOptionImplemented is true; otherwise it is not present.
44 / STA Channel Switch Request / The STA Channel Switch Request element contains the candidate 20 MHz channels that the non-AP STA is willing to operate on.
9.3.3.6 Association Response frame format[a5]
Order: 11ai adds 31-36, 11ah adds 37-49, 11aq adds none, 11ak adds 30-31 (appears to be out of date), 11aj adds three (numbers unassigned)
Change Table9-30 (Association Response frame body) as follows maintaining numeric order (only rows with changes are shown):
Association Response frame bodyOrder / Information / Notes
29 / TWT / The TWT element is optionally present if dot11TWTOptionActivated
is true; otherwise not present.
The TWT element is present if dot11TWTOptionActivated is true and the TWT element is present in the Association Request frame that elicited this Association Response frame.
The TWT element is optionally present if dot11TWTOptionActivated is true and the TWT Requester Supported field in the HE Capabilities in the Association Request frame that elicited this Association Response frame is one.
54 / HE Capabilities / The HE Capabilities element is present when dot11HEOptionImplemented is true; otherwise it is not present.
55 / HE Operation / The HE Operation element is present when dot11HEOptionImplemented is true; otherwise it is not present.
56 / BSS Color Change Announcement / The BSS Color Change Announcement element is optionally present when dot11HEOptionImplemented is true; otherwise it is not pre-sent.
57 / Spatial Reuse Parameter Set / The Spatial Reuse Parameter Set element is optionally present if dot11HighEfficiencyOptionImplemented is true.(#8111)
58 / STA Channel Switch Response / The STA Channel Switch Response element contains the 20 MHz channel that the non-AP STA is assigned to operate on.
9.3.3.7 Reassociation Request frame format
Order: 11ai adds 29-33, 11ah adds 34-43, 11aq adds none, 11ak adds 29 (appears to be out of date), 11aj adds two (numbers unassigned)
Insert the following row in Table9-31 (Reassociation Request frame body) (header shown for convenience):
Reassociation Request frame bodyOrder / Information / Notes
47 / HE Capabilities / The HE Capabilities element is present when dot11HEOptionImplemented is true; otherwise it is not present.
48 / STA Channel Switch Request / The STA Channel Switch Request element contains the candidate 20 MHz channels that the non-AP STA is will to operate on.
9.3.3.8 Reassociation Response frame format
Order: 11ai adds 35-49, 11ah adds 41-52, 11aq adds none, 11ak adds 34 and 30 (appears to be an error), 11aj adds three (numbers unassigned)
Change Table9-32 (Reassociation Response frame body) as follows maintaining numeric order (only rows with changes are shown):
Reassociation Response frame bodyOrder / Information / Notes
42 / TWT / The TWT element is optionally present if dot11TWTOptionActivated
is true; otherwise not present.
The TWT element is present if dot11TWTOptionActivated is true and the TWT element is present in the Reassociation Request frame that elicited this Reassociation Response frame.
The TWT element is optionally present if dot11TWTOptionActivated is true and the TWT Requester Supported field in the HE Capabilities in the Reassociation Request frame that elicited this Association Response frame is one.
55 / HE Capabilities / The HE Capabilities element is present when dot11HEOptionImplemented is true; otherwise it is not present.
56 / HE Operation / The HE Operation element is present when dot11HEOptionImplemented is true; otherwise it is not present.
57 / BSS Color Change Announcement / The BSS Color Change Announcement element is optionally present when dot11HEOptionImplemented is true; otherwise it is not pre-sent.
58 / Spatial Reuse Parameter Set / The Spatial Reuse Parameter Set element is optionally present if dot11HighEfficiencyOptionImplemented is true.(#8111)
59 / STA Channel Switch Response / The STA Channel Switch Response element contains the channel index that the non-AP STA is assigned to to operate on
TGax Editor: Please modify the following section as follows
9.6.28 HE Action frame details
9.6.28.1 HE Action field
An HE Action field, in the octet immediately after the Category field, differentiates the HE Action frame formats. The HE Action field values associated with each frame format within the HE category are defined in Table9-421z (HE Action field values).
HE Action field valuesValue / Meaning
0 / HE Compressed Beamforming And CQI
1 / HE BSS Color Change Announcement
2 / STA Channel Switch
2-255 / Reserved
TGax Editor: Please insert the following subsection after 9.6.29
9.6.30STA Channel SwitchAction Frame Details[a6]
9.6.30.1 STA Channel Switch Action Field
An STA Channel Switch Action field, in the octet immediately after the Category field, differentiates the HE Channel Switch Action frame formats. The STA Channel SwitchAction field values associated with each frame format within the STA Channel Switch category are defined in Table9-xx (STA Channel SwitchAction field values).
STA Channel Switch Action field valuesValue / Meaning
0 / STA Channel SwitchRequest
1 / STA Channel SwitchResponse
2-255 / Reserved
9.6.30.2STA Channel SwitchRequest frame format
The STA Channel SwitchRequest frame is an Action frame of category STA Channel Switch. It is sent by an HE non-AP STA to its associated AP to request switching the operating channel or sent by an HE AP to a non-AP STA to request the non-AP STA to switch its operating channel. The Action field ofSTA Channel Switch Request frame contains the information shown in Table9-xx (STA Channel SwitchRequest frame Action field format).
STA Channel Switch Request frame Action field formatOrder / Information
1 / Category
2 / STA Channel Switch Action
3 / Dialog Token
4 / STA Channel Switch Request element (see 9.4.2.226 (STA Channel Switch Request element))
9.6.30.3 STA Channel SwitchResponse frame format
The STA Channel Switch Response frame is an Action frame of category STA Channel Switch. It is sent by an HE AP in response to a request from a non-AP STA to switchthe non-AP STA’s operating channel or sent by the non-AP STA in response to STA Channel Switch Request frame sent by its associated AP. The Action field of a STA Channel SwitchResponse frame contains the information shown in Table9-421af (STA Channel SwitchResponse frame Action field format).
STA Channel Switch Response frame Action field formatOrder / Information
1 / Category
2 / STA Channel Switch Action
3 / Dialog Token
4 / Status Code
5 / STA Channel Switch Response element (see 9.4.2.227 (STA Channel Switch Response element))
The Dialog Token field is set to the value in the corresponding STA Channel Switch Request frame.
The Status Code field is used to indicate the result of the corresponding STA Channel Switch Request frame. Valid values for the Status Code field is defined in 9.4.1.9.
TGax Editor: Please insert the following section at the end of section 6.
TGax Editor: Please insert the following section after section 27.16.
27.16 20 MHz Operating STA on Non-primary 20 MHz Channel
27.16.1 Overview
Only a 20MHz-onlyn HE STA operating at 20 MHz only may operate on any a non-primary 20 MHz channel including non-primary 20 MHz channels. The procedure for the STA to operate on non-primary 20 MHz channel is described in this subclause. The operation on non-primary 20 MHz channel is optional for HE non-AP STAs and HE APs.
A STA shall set the Non-Primary Channel Operation field in HE capability to 1 if dot11NonPrimaryChannelOptionallyImplemented is set to true.
27.16.2 Operating Channel Switch Procedure
STA operating channel switch may be initiated for an HE STA that set UL MU Disable subfield to 0 in its mostly recent operating mode indication (27.8). Either an HE AP or a non-AP STA may initiate the operating channel switch for the non-AP STA when both the AP and the non-AP STA have set 1 in the Non-Primary Channel Operation subfield in HE Capabilities.
An20 MHz operating non-AP STA may include a STA Channel Switch Request Element in (Re)Association Request frame to inform an HE AP the candidate 20 MHz channel that the non-AP STA is willing to operate on. An AP may include a STA Channel Switch Response element in the corresponding (Re)Association Response frame. [a7][a8]
How the non-AP STA chooses the candidate 20 MHz channels to include in the STA Channel Switch Request Element and how AP selects a particular 20 MHz channel indicated the STA Channel Switch Response frame for the STA to operate on is beyond the scope of this specification.
After the non-AP STA is associated with an HE AP, the non-AP STA[a9]that may use STA Channel Switch Request frame (9.6.30.2) to request switching its operating channel if the receiving STA has indicated support of Non-Primary Channel Operation in its HE Capabilities element. After receiving aSTA Channel Switch Request frame from a non-AP STA, the HE AP shall respond with aSTA Channel Switch Response frameif dot11NonPrimaryChannelOptionallyImplemented is set to true and the HE AP may assign the non-AP STA to any20 MHz channel as the operating channel. After the non-AP STA has received ing aSTA Channel Switch Response frame which is a response to a STA Channel Switch Request frame sent by the non-AP STA and whose Status Code field indicates SUCCESS, the non-AP STA shall start switching to the channel indicated in the Channel Index field (9.4.2.227) of the received STA channel Switch Response frame if the Channel Index field indicates a different operating channel from the one that the non-AP STA is currently operating on.
An HE AP may use STA Channel Switch Request frame (9.6.30.2) to request a non-AP STA[a10] to switch its operating channel if the receiving STA has indicated support of Non-Primary Channel Operation in its HE Capabilities element. After receiving a STA Channel Switch Request frame from the associated AP, the non-AP STA shall respond with a STA Channel Switch Response frame[a11] if dot11NonPrimaryChannelOptionallyImplemented is set to true. If the Status Code is SUCCESS, then the STA shall set the Channel Index subfield to be the same value indicated in the STA Channel Switch Request received from the HE AP.Otherwise, the Channel Index is set to 0. After transmitting the STA Channel Switch Response frame which is a response to a STA Channel Switch Request frame received by the non-AP STA and whose Status Code field indicates SUCCESS, the non-AP STA shall start switching to the channel indicated in the Channel Index field (9.4.2.227) of the received STA channel Switch Requestframe if the Channel Index field indicates a different operating channel from the one that the non-AP STA is currently operating on.